Page 466 - Review of Medical Microbiology and Immunology ( PDFDrive )

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CHAPTER 54 Cestodes
455

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Cattle (T. saginata) and pigs (T. solium)
become infected by ingesting vegetation
contaminated by eggs or gravid proglottids

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FIGURE 54–1
Taenia solium and Taenia saginata. Life cycle. Right side of figure describes the stages within the human (blue arrows).
Humans are infected at step 1 when they ingest undercooked pork (T. solium) or beef (T. saginata) containing cysticerci (larval stage). Adult
tapeworms form in intestine and lay eggs. Pigs and cattle are infected when they ingest either the eggs or proglottids in human stool. Left
side of figure describes the stages within the pigs and cattle (red arrows). (Source: Public Health Image Library, Centers for Disease Control and
Prevention.)

Treatment

The treatment of choice for the intestinal worms is praziqu-
Disease
antel. The treatment for cysticercosis is either praziquantel
Taenia saginata causes taeniasis. Taenia saginata larvae do
or albendazole, but surgical excision may be necessary.
not cause cysticercosis.
Prevention
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mebooksfree.com mebooksfree.com mebooksfree.com Important Properties mebooksfree.com mebooksfree.com
Prevention of taeniasis involves cooking pork adequately
Taenia saginata has a scolex with four suckers but, in contrast
and disposing waste properly so that pigs cannot ingest
to T. solium, no hooklets. Its gravid proglottids have 15 to 25
human feces. Prevention of cysticercosis consists of treat-
primary uterine branches, in contrast to T. solium proglottids,
ment of patients to prevent autoinfection plus observation
which have 5 to 10 (see Figure 54–2C and D). The eggs are
of proper hygiene, including handwashing, to prevent con-
morphologically indistinguishable from those of T. solium.
tamination of food with the eggs.

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